<!DOCTYPE html>
<html>

<head>
    <title>jquery测试</title>
    <script src="https://s3.pstatp.com/cdn/expire-1-M/jquery/3.2.1/jquery.min.js"></script>
    <script>
        function myFunction()
        {
        $("#h01").attr("style","color:red").html("Hello jQuery")
        }
        $(document).ready(myFunction);
        
    </script>
</head>

<body>
    <h1 id="h01"></h1>
</body>

</html>